4.

Each draft TSI shall be drawn up in two stages. First of all, the joint representative body shall identify the basic parameters for this TSI as well as the interfaces with the other subsystems and any other specific cases that may be necessary. The most viable alternative solutions accompanied by technical and economic justification shall be put forward for each of these parameters and interfaces. A decision shall be taken in accordance with the procedure set out in Article 21(2); if necessary, specific cases shall be cited. The joint representative body shall then draw up the draft TSI on the basis of these basic parameters. Where appropriate, the joint representative body shall take account of technical progress, of standardisation work already carried out, of working parties already in place and of acknowledged research work. An overall assessment of the estimated costs and benefits of the implementation of the TSIs shall be attached to the draft TSI; this assessment shall indicate the likely impact for all the operators and economic agents involved.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-29 · Text as adopted (Official Journal); later amendments are not incorporated in this text.